Zoom into picture.
Can this be done?
Howard,
welcome to Keynote Discussions.
You cannot do that with Keynote.
As a workaround, create a second image with the
desired size and the detail you want to show.
Add this image on the first image in Keynote. Ceate a
build where the first image disappears while the
second one (your detail) appears, e.g. effect Scale.
In the build order drawer, set "Start Build" to
"Together with #x" where #x is the number of the
disappearing image.
You could also create a QuickTime movie of your
picture applying Ken-Burns-Effect to zoom-in and drag
the QT movie to your Keynote slide.
Zoom into picture.